William jackson chapman



(No Model.)

STEAM BOILER.

Patented Dec. 21, 1886.

WITNESSES: $4M.

ATTORNEYS.

UNITED STATES PATENT rrrcn,

WILLIAM J AOKSON CHAPMAN, OF RUTLAND, VERMONT.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 354,686, dated December21, 1886.

Application filed April I, 1886.

tional elevation of a boiler embodying my im- I provement.

My invention relates to vertical boilers; and it consists in thecombination, with a vertical boiler having vertical fines and a recessedhead, of an auxiliary annular chamber, forming a receptacle for waterand steam, and connected with the upper part of the boiler by series oftubes, the auxiliary chamber forming, in connection with the recessedhead, a smoke-chamber and an extended heatiug surface for utilizing apart of the heat which is usually allowed to escape from the smokepipe.

In vertical boilers as commonly constructed, the upper ends of thevertical fines being exposed to hot steam upon one side and the heat ofthe fire upon the other, and the upper head or fine-sheet being alsosubjected to the action of steam upon one side and the fire upon theother side, the fines soon become leaky and are eventually destroyed.

The object of my invention is to obviate this difficulty by arrangingthe boiler so that the upper ends and the fines will be continuouslysubmerged in water.

The body A of my improved boiler is provided with a fire-box, B, with arecessed head, 0, and Vertical fines a, passing through the fine-sheetof the fire-box and through the recessed head. The annular space I),surrounding the recessed head 0, is provided with series of outlet-pipesD, which vary in numher and size with the size of the boiler.

Above the boiler,and resting upon the annular surface at the topthereof, is a chamber, E, preferably of the same diameter externally asthe body of the boiler. A hollow cone, F, having a flange, 0, at, itsbase, is secured in the chamber E. The upper and smaller end of thehollow cone F connects with a collar, G, adapted to receive thesmoke-pipe.

The internal diameter of the base of the hollow cone is the same as theinternal diameter Serial No. 197,434. (No model) of the recessed head 0,and the hollow cone forms in connection with the recessed head asmoke-chamber, in which is received the products of combustion risingthrough the flues a.

In the side of the chamber E, near the bot tom thereof, are insertedseries of tubes D, corresponding with the tubes D in the bodyA of theboiler. The tubes D are turned downward at right angles, and the tubes Dare turned upward at right angles, the two tubes being united byaunionor coupling, (I, screwed upon the adjacent ends of the tubes, asindicated in the drawing.

By means of the tubes D D communication is established between the upperpart of the body A of the boiler and the lower part of the chamber E.The water-level in myimproved boiler is preferably maintained above themouths of the tubes D. In this manner the submerging of the flues a isalways insured.

The chamber E, besides raising the waterlevel of the boiler so that thefines are protected, provides efiicient steam-room, increases theheating-surface of the boiler, and utilizes the heat of the flues, whichwithout my improvement would pass directly to the smokepipe and be lost.By connecting the chamber E with the bodyA of the boiler in the mannerdescribed, the chamber can at any time be removed for repairs or forrepairing the boiler.

Having thus described my invention, whatl claim as new, and desire tosecure by Letters Patent, is 1. The combination, with the boiler-body A,having the recessed head 0, and annular.

space b above the fines, of the auxiliary annular chamber E, formedaround the hollow cone F, and connected with the annular space b of theboiler by pipes D D, substantially as herein shown and described.

2. As an improved article of manufacture, a boiler formed of the body A,having a firebox, B, the recessed head 0, and fines a, the annularchamber E, formed around the hollow cone F, the pipes D D, and couplingsd, connecting said pipes, substantially as herein shown and described.

WILLIAM JACKSON CHAPMAN.

Witnesses:

NATHL. S. STEARNS, WILLIAM F. WINsnrP.

